Airflow grading system with raised dust recovery function

The invention relates to an airflow classification system with a raised dust recovery function. The device comprises a feeding mechanism, an airflow grading mechanism and a raised dust recycling mechanism, the raised dust recycling mechanism comprises a first air inlet pipeline, a dust filtering structure, a recycling air blower and an air outlet pipeline, the dust filtering structure comprises a filtering cavity, a filtering bag and a dust collecting container, the filtering cavity communicates with the dust collecting container, and the dust collecting container is arranged at the bottom of the filtering cavity; the filter bag is arranged in the filter cavity, an air inlet of the first air inlet pipeline corresponds to a discharge port of the feeding mechanism, an air outlet of the first air inlet pipeline is communicated with the interior of the filter cavity and the exterior of the filter bag, an air inlet of the air outlet pipeline is communicated with the interior of the filter bag, and an air outlet of